1 // SPDX-License-Identifier: GPL-2.0 2 3 #include <linux/entry-kvm.h> 4 #include <linux/kvm_host.h> 5 6 static int xfer_to_guest_mode_work(struct kvm_vcpu *vcpu, unsigned long ti_work) 7 { 8 do { 9 int ret; 10 11 if (ti_work & _TIF_NOTIFY_SIGNAL) 12 tracehook_notify_signal(); 13 14 if (ti_work & _TIF_SIGPENDING) { 15 kvm_handle_signal_exit(vcpu); 16 return -EINTR; 17 } 18 19 if (ti_work & _TIF_NEED_RESCHED) 20 schedule(); 21 22 if (ti_work & _TIF_NOTIFY_RESUME) 23 tracehook_notify_resume(NULL); 24 25 ret = arch_xfer_to_guest_mode_handle_work(vcpu, ti_work); 26 if (ret) 27 return ret; 28 29 ti_work = READ_ONCE(current_thread_info()->flags); 30 } while (ti_work & XFER_TO_GUEST_MODE_WORK || need_resched()); 31 return 0; 32 } 33 34 int xfer_to_guest_mode_handle_work(struct kvm_vcpu *vcpu) 35 { 36 unsigned long ti_work; 37 38 /* 39 * This is invoked from the outer guest loop with interrupts and 40 * preemption enabled. 41 * 42 * KVM invokes xfer_to_guest_mode_work_pending() with interrupts 43 * disabled in the inner loop before going into guest mode. No need 44 * to disable interrupts here. 45 */ 46 ti_work = READ_ONCE(current_thread_info()->flags); 47 if (!(ti_work & XFER_TO_GUEST_MODE_WORK)) 48 return 0; 49 50 return xfer_to_guest_mode_work(vcpu, ti_work); 51 } 52 EXPORT_SYMBOL_GPL(xfer_to_guest_mode_handle_work); 53